## Abstract

Two series of Fe_{81-x}Ni_{x}Ga _{19}/Si(1 0 0) and Fe_{81-y}Ni_{y}Ga _{19}/glass films, where x or y = 0-26, were made by the magnetron sputtering method. The film thickness (t_{f}) was fixed at 100 nm. We have performed three kinds of experiments on these films: (i) the saturation magnetostriction (λ_{S}) measurement; (ii) the easy-axis and hard-axis magnetic hysteresis loop measurements; and (iii) the ferromagnetic resonance (FMR) experiment to find the resonance field (H_{R}) with an X-band cavity tuned at f_{R} = 9.6 GHz. The natural resonance frequency, f_{FMR}, of the Kittel mode at zero external field (H = 0) is defined as f_{FMR} ≒ ν[H_{K}4πM_{S}]^{1/2}, where γ = 2πν is the gyromagnetic ratio, H_{K} and 4πM_{S} are the uniaxial anisotropy field and saturation magnetization, and H_{K} << 4πM_{S}. The Gilbert damping constant, α, is calculated from the formula, α = [ν(ΔH)_{S}]/(2f_{R}), where (ΔH)_{exp} = (ΔH)_{S} + (ΔH)_{A}, (ΔH)_{exp} is the half-width of the absorption peak around the resonance field H_{R}, (ΔH)_{S} is the symmetric part of (ΔH)_{exp}, and (ΔH)_{A} is the asymmetric part. The degree of asymmetry, (ΔH)_{A}/(ΔH)_{exp}, is associated with the structural and/or magnetic inhomogeneities in the film. The main findings of this study are as follows: (A) f_{FMR} tends to decrease, as x or y increases; (B) α decreases from 0.052 to 0.020 and then increases from 0.020 to 0.050, as x increases, and α decreases from 0.060 to 0.013 in general, as y increases; and (C) λ_{S} reaches a local maximum when x = 22. We conclude that the Fe_{59}Ni_{22}Ga _{19}/glass film should be the most suitable for application in magneto-electric microwave devices.

Original language | English |
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Pages (from-to) | 111-115 |

Number of pages | 5 |

Journal | Journal of Alloys and Compounds |

Volume | 562 |

DOIs | |

State | Published - 15 Jun 2013 |

## Keywords

- FeNiGa films
- Ferromagnetic resonance
- Magnetostriction